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ARM: ep93xx: move timer to its own file
[linux/fpc-iii.git] / net / ipv6 / mcast.c
blob083b2927fc67aaa3939fff42a1c6ee9f1ca70afe
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <linux/pkt_sched.h>
48 #include <net/mld.h>
49
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
52
53 #include <net/net_namespace.h>
54 #include <net/sock.h>
55 #include <net/snmp.h>
56
57 #include <net/ipv6.h>
58 #include <net/protocol.h>
59 #include <net/if_inet6.h>
60 #include <net/ndisc.h>
61 #include <net/addrconf.h>
62 #include <net/ip6_route.h>
63 #include <net/inet_common.h>
64
65 #include <net/ip6_checksum.h>
66
67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
72 };
73
74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
75
76 static void igmp6_join_group(struct ifmcaddr6 *ma);
77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
78 static void igmp6_timer_handler(unsigned long data);
79
80 static void mld_gq_timer_expire(unsigned long data);
81 static void mld_ifc_timer_expire(unsigned long data);
82 static void mld_ifc_event(struct inet6_dev *idev);
83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
85 static void mld_clear_delrec(struct inet6_dev *idev);
86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
87 static int sf_setstate(struct ifmcaddr6 *pmc);
88 static void sf_markstate(struct ifmcaddr6 *pmc);
89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
92 int delta);
93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
95 int delta);
96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98
99 #define MLD_QRV_DEFAULT 2
100 /* RFC3810, 9.2. Query Interval */
101 #define MLD_QI_DEFAULT (125 * HZ)
102 /* RFC3810, 9.3. Query Response Interval */
103 #define MLD_QRI_DEFAULT (10 * HZ)
104
105 /* RFC3810, 8.1 Query Version Distinctions */
106 #define MLD_V1_QUERY_LEN 24
107 #define MLD_V2_QUERY_LEN_MIN 28
108
109 #define IPV6_MLD_MAX_MSF 64
110
111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
113
114 /*
115 * socket join on multicast group
116 */
117
118 #define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
120 pmc != NULL; \
121 pmc = rcu_dereference(pmc->next))
122
123 static int unsolicited_report_interval(struct inet6_dev *idev)
124 {
125 int iv;
126
127 if (mld_in_v1_mode(idev))
128 iv = idev->cnf.mldv1_unsolicited_report_interval;
129 else
130 iv = idev->cnf.mldv2_unsolicited_report_interval;
131
132 return iv > 0 ? iv : 1;
133 }
134
135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
136 {
137 struct net_device *dev = NULL;
138 struct ipv6_mc_socklist *mc_lst;
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct net *net = sock_net(sk);
141 int err;
142
143 ASSERT_RTNL();
144
145 if (!ipv6_addr_is_multicast(addr))
146 return -EINVAL;
147
148 rcu_read_lock();
149 for_each_pmc_rcu(np, mc_lst) {
150 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
151 ipv6_addr_equal(&mc_lst->addr, addr)) {
152 rcu_read_unlock();
153 return -EADDRINUSE;
154 }
155 }
156 rcu_read_unlock();
157
158 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
159
160 if (!mc_lst)
161 return -ENOMEM;
162
163 mc_lst->next = NULL;
164 mc_lst->addr = *addr;
165
166 if (ifindex == 0) {
167 struct rt6_info *rt;
168 rt = rt6_lookup(net, addr, NULL, 0, 0);
169 if (rt) {
170 dev = rt->dst.dev;
171 ip6_rt_put(rt);
172 }
173 } else
174 dev = __dev_get_by_index(net, ifindex);
175
176 if (!dev) {
177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178 return -ENODEV;
179 }
180
181 mc_lst->ifindex = dev->ifindex;
182 mc_lst->sfmode = MCAST_EXCLUDE;
183 rwlock_init(&mc_lst->sflock);
184 mc_lst->sflist = NULL;
185
186 /*
187 * now add/increase the group membership on the device
188 */
189
190 err = ipv6_dev_mc_inc(dev, addr);
191
192 if (err) {
193 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
194 return err;
195 }
196
197 mc_lst->next = np->ipv6_mc_list;
198 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
199
200 return 0;
201 }
202 EXPORT_SYMBOL(ipv6_sock_mc_join);
203
204 /*
205 * socket leave on multicast group
206 */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 ASSERT_RTNL();
215
216 if (!ipv6_addr_is_multicast(addr))
217 return -EINVAL;
218
219 for (lnk = &np->ipv6_mc_list;
220 (mc_lst = rtnl_dereference(*lnk)) != NULL;
221 lnk = &mc_lst->next) {
222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
227
228 dev = __dev_get_by_index(net, mc_lst->ifindex);
229 if (dev) {
230 struct inet6_dev *idev = __in6_dev_get(dev);
231
232 (void) ip6_mc_leave_src(sk, mc_lst, idev);
233 if (idev)
234 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
235 } else
236 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
237
238 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
239 kfree_rcu(mc_lst, rcu);
240 return 0;
241 }
242 }
243
244 return -EADDRNOTAVAIL;
245 }
246 EXPORT_SYMBOL(ipv6_sock_mc_drop);
247
248 /* called with rcu_read_lock() */
249 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
250 const struct in6_addr *group,
251 int ifindex)
252 {
253 struct net_device *dev = NULL;
254 struct inet6_dev *idev = NULL;
255
256 if (ifindex == 0) {
257 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
258
259 if (rt) {
260 dev = rt->dst.dev;
261 ip6_rt_put(rt);
262 }
263 } else
264 dev = dev_get_by_index_rcu(net, ifindex);
265
266 if (!dev)
267 return NULL;
268 idev = __in6_dev_get(dev);
269 if (!idev)
270 return NULL;
271 read_lock_bh(&idev->lock);
272 if (idev->dead) {
273 read_unlock_bh(&idev->lock);
274 return NULL;
275 }
276 return idev;
277 }
278
279 void ipv6_sock_mc_close(struct sock *sk)
280 {
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct ipv6_mc_socklist *mc_lst;
283 struct net *net = sock_net(sk);
284
285 if (!rcu_access_pointer(np->ipv6_mc_list))
286 return;
287
288 rtnl_lock();
289 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
290 struct net_device *dev;
291
292 np->ipv6_mc_list = mc_lst->next;
293
294 dev = __dev_get_by_index(net, mc_lst->ifindex);
295 if (dev) {
296 struct inet6_dev *idev = __in6_dev_get(dev);
297
298 (void) ip6_mc_leave_src(sk, mc_lst, idev);
299 if (idev)
300 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
301 } else
302 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
303
304 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
305 kfree_rcu(mc_lst, rcu);
306
307 }
308 rtnl_unlock();
309 }
310
311 int ip6_mc_source(int add, int omode, struct sock *sk,
312 struct group_source_req *pgsr)
313 {
314 struct in6_addr *source, *group;
315 struct ipv6_mc_socklist *pmc;
316 struct inet6_dev *idev;
317 struct ipv6_pinfo *inet6 = inet6_sk(sk);
318 struct ip6_sf_socklist *psl;
319 struct net *net = sock_net(sk);
320 int i, j, rv;
321 int leavegroup = 0;
322 int pmclocked = 0;
323 int err;
324
325 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
326 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
327
328 if (!ipv6_addr_is_multicast(group))
329 return -EINVAL;
330
331 rcu_read_lock();
332 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
333 if (!idev) {
334 rcu_read_unlock();
335 return -ENODEV;
336 }
337
338 err = -EADDRNOTAVAIL;
339
340 for_each_pmc_rcu(inet6, pmc) {
341 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
342 continue;
343 if (ipv6_addr_equal(&pmc->addr, group))
344 break;
345 }
346 if (!pmc) { /* must have a prior join */
347 err = -EINVAL;
348 goto done;
349 }
350 /* if a source filter was set, must be the same mode as before */
351 if (pmc->sflist) {
352 if (pmc->sfmode != omode) {
353 err = -EINVAL;
354 goto done;
355 }
356 } else if (pmc->sfmode != omode) {
357 /* allow mode switches for empty-set filters */
358 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
359 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
360 pmc->sfmode = omode;
361 }
362
363 write_lock(&pmc->sflock);
364 pmclocked = 1;
365
366 psl = pmc->sflist;
367 if (!add) {
368 if (!psl)
369 goto done; /* err = -EADDRNOTAVAIL */
370 rv = !0;
371 for (i = 0; i < psl->sl_count; i++) {
372 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
373 if (rv == 0)
374 break;
375 }
376 if (rv) /* source not found */
377 goto done; /* err = -EADDRNOTAVAIL */
378
379 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
380 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
381 leavegroup = 1;
382 goto done;
383 }
384
385 /* update the interface filter */
386 ip6_mc_del_src(idev, group, omode, 1, source, 1);
387
388 for (j = i+1; j < psl->sl_count; j++)
389 psl->sl_addr[j-1] = psl->sl_addr[j];
390 psl->sl_count--;
391 err = 0;
392 goto done;
393 }
394 /* else, add a new source to the filter */
395
396 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
397 err = -ENOBUFS;
398 goto done;
399 }
400 if (!psl || psl->sl_count == psl->sl_max) {
401 struct ip6_sf_socklist *newpsl;
402 int count = IP6_SFBLOCK;
403
404 if (psl)
405 count += psl->sl_max;
406 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
407 if (!newpsl) {
408 err = -ENOBUFS;
409 goto done;
410 }
411 newpsl->sl_max = count;
412 newpsl->sl_count = count - IP6_SFBLOCK;
413 if (psl) {
414 for (i = 0; i < psl->sl_count; i++)
415 newpsl->sl_addr[i] = psl->sl_addr[i];
416 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
417 }
418 pmc->sflist = psl = newpsl;
419 }
420 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
421 for (i = 0; i < psl->sl_count; i++) {
422 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
423 if (rv == 0) /* There is an error in the address. */
424 goto done;
425 }
426 for (j = psl->sl_count-1; j >= i; j--)
427 psl->sl_addr[j+1] = psl->sl_addr[j];
428 psl->sl_addr[i] = *source;
429 psl->sl_count++;
430 err = 0;
431 /* update the interface list */
432 ip6_mc_add_src(idev, group, omode, 1, source, 1);
433 done:
434 if (pmclocked)
435 write_unlock(&pmc->sflock);
436 read_unlock_bh(&idev->lock);
437 rcu_read_unlock();
438 if (leavegroup)
439 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
440 return err;
441 }
442
443 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
444 {
445 const struct in6_addr *group;
446 struct ipv6_mc_socklist *pmc;
447 struct inet6_dev *idev;
448 struct ipv6_pinfo *inet6 = inet6_sk(sk);
449 struct ip6_sf_socklist *newpsl, *psl;
450 struct net *net = sock_net(sk);
451 int leavegroup = 0;
452 int i, err;
453
454 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
455
456 if (!ipv6_addr_is_multicast(group))
457 return -EINVAL;
458 if (gsf->gf_fmode != MCAST_INCLUDE &&
459 gsf->gf_fmode != MCAST_EXCLUDE)
460 return -EINVAL;
461
462 rcu_read_lock();
463 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
464
465 if (!idev) {
466 rcu_read_unlock();
467 return -ENODEV;
468 }
469
470 err = 0;
471
472 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
473 leavegroup = 1;
474 goto done;
475 }
476
477 for_each_pmc_rcu(inet6, pmc) {
478 if (pmc->ifindex != gsf->gf_interface)
479 continue;
480 if (ipv6_addr_equal(&pmc->addr, group))
481 break;
482 }
483 if (!pmc) { /* must have a prior join */
484 err = -EINVAL;
485 goto done;
486 }
487 if (gsf->gf_numsrc) {
488 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
489 GFP_ATOMIC);
490 if (!newpsl) {
491 err = -ENOBUFS;
492 goto done;
493 }
494 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
495 for (i = 0; i < newpsl->sl_count; ++i) {
496 struct sockaddr_in6 *psin6;
497
498 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
499 newpsl->sl_addr[i] = psin6->sin6_addr;
500 }
501 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
502 newpsl->sl_count, newpsl->sl_addr, 0);
503 if (err) {
504 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
505 goto done;
506 }
507 } else {
508 newpsl = NULL;
509 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
510 }
511
512 write_lock(&pmc->sflock);
513 psl = pmc->sflist;
514 if (psl) {
515 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
516 psl->sl_count, psl->sl_addr, 0);
517 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
518 } else
519 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
520 pmc->sflist = newpsl;
521 pmc->sfmode = gsf->gf_fmode;
522 write_unlock(&pmc->sflock);
523 err = 0;
524 done:
525 read_unlock_bh(&idev->lock);
526 rcu_read_unlock();
527 if (leavegroup)
528 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
529 return err;
530 }
531
532 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
533 struct group_filter __user *optval, int __user *optlen)
534 {
535 int err, i, count, copycount;
536 const struct in6_addr *group;
537 struct ipv6_mc_socklist *pmc;
538 struct inet6_dev *idev;
539 struct ipv6_pinfo *inet6 = inet6_sk(sk);
540 struct ip6_sf_socklist *psl;
541 struct net *net = sock_net(sk);
542
543 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
544
545 if (!ipv6_addr_is_multicast(group))
546 return -EINVAL;
547
548 rcu_read_lock();
549 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
550
551 if (!idev) {
552 rcu_read_unlock();
553 return -ENODEV;
554 }
555
556 err = -EADDRNOTAVAIL;
557 /* changes to the ipv6_mc_list require the socket lock and
558 * rtnl lock. We have the socket lock and rcu read lock,
559 * so reading the list is safe.
560 */
561
562 for_each_pmc_rcu(inet6, pmc) {
563 if (pmc->ifindex != gsf->gf_interface)
564 continue;
565 if (ipv6_addr_equal(group, &pmc->addr))
566 break;
567 }
568 if (!pmc) /* must have a prior join */
569 goto done;
570 gsf->gf_fmode = pmc->sfmode;
571 psl = pmc->sflist;
572 count = psl ? psl->sl_count : 0;
573 read_unlock_bh(&idev->lock);
574 rcu_read_unlock();
575
576 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
577 gsf->gf_numsrc = count;
578 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
579 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
580 return -EFAULT;
581 }
582 /* changes to psl require the socket lock, and a write lock
583 * on pmc->sflock. We have the socket lock so reading here is safe.
584 */
585 for (i = 0; i < copycount; i++) {
586 struct sockaddr_in6 *psin6;
587 struct sockaddr_storage ss;
588
589 psin6 = (struct sockaddr_in6 *)&ss;
590 memset(&ss, 0, sizeof(ss));
591 psin6->sin6_family = AF_INET6;
592 psin6->sin6_addr = psl->sl_addr[i];
593 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
594 return -EFAULT;
595 }
596 return 0;
597 done:
598 read_unlock_bh(&idev->lock);
599 rcu_read_unlock();
600 return err;
601 }
602
603 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
604 const struct in6_addr *src_addr)
605 {
606 struct ipv6_pinfo *np = inet6_sk(sk);
607 struct ipv6_mc_socklist *mc;
608 struct ip6_sf_socklist *psl;
609 bool rv = true;
610
611 rcu_read_lock();
612 for_each_pmc_rcu(np, mc) {
613 if (ipv6_addr_equal(&mc->addr, mc_addr))
614 break;
615 }
616 if (!mc) {
617 rcu_read_unlock();
618 return true;
619 }
620 read_lock(&mc->sflock);
621 psl = mc->sflist;
622 if (!psl) {
623 rv = mc->sfmode == MCAST_EXCLUDE;
624 } else {
625 int i;
626
627 for (i = 0; i < psl->sl_count; i++) {
628 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
629 break;
630 }
631 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
632 rv = false;
633 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
634 rv = false;
635 }
636 read_unlock(&mc->sflock);
637 rcu_read_unlock();
638
639 return rv;
640 }
641
642 static void igmp6_group_added(struct ifmcaddr6 *mc)
643 {
644 struct net_device *dev = mc->idev->dev;
645 char buf[MAX_ADDR_LEN];
646
647 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
648 IPV6_ADDR_SCOPE_LINKLOCAL)
649 return;
650
651 spin_lock_bh(&mc->mca_lock);
652 if (!(mc->mca_flags&MAF_LOADED)) {
653 mc->mca_flags |= MAF_LOADED;
654 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
655 dev_mc_add(dev, buf);
656 }
657 spin_unlock_bh(&mc->mca_lock);
658
659 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
660 return;
661
662 if (mld_in_v1_mode(mc->idev)) {
663 igmp6_join_group(mc);
664 return;
665 }
666 /* else v2 */
667
668 mc->mca_crcount = mc->idev->mc_qrv;
669 mld_ifc_event(mc->idev);
670 }
671
672 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
673 {
674 struct net_device *dev = mc->idev->dev;
675 char buf[MAX_ADDR_LEN];
676
677 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
678 IPV6_ADDR_SCOPE_LINKLOCAL)
679 return;
680
681 spin_lock_bh(&mc->mca_lock);
682 if (mc->mca_flags&MAF_LOADED) {
683 mc->mca_flags &= ~MAF_LOADED;
684 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
685 dev_mc_del(dev, buf);
686 }
687
688 if (mc->mca_flags & MAF_NOREPORT)
689 goto done;
690 spin_unlock_bh(&mc->mca_lock);
691
692 if (!mc->idev->dead)
693 igmp6_leave_group(mc);
694
695 spin_lock_bh(&mc->mca_lock);
696 if (del_timer(&mc->mca_timer))
697 atomic_dec(&mc->mca_refcnt);
698 done:
699 ip6_mc_clear_src(mc);
700 spin_unlock_bh(&mc->mca_lock);
701 }
702
703 /*
704 * deleted ifmcaddr6 manipulation
705 */
706 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
707 {
708 struct ifmcaddr6 *pmc;
709
710 /* this is an "ifmcaddr6" for convenience; only the fields below
711 * are actually used. In particular, the refcnt and users are not
712 * used for management of the delete list. Using the same structure
713 * for deleted items allows change reports to use common code with
714 * non-deleted or query-response MCA's.
715 */
716 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
717 if (!pmc)
718 return;
719
720 spin_lock_bh(&im->mca_lock);
721 spin_lock_init(&pmc->mca_lock);
722 pmc->idev = im->idev;
723 in6_dev_hold(idev);
724 pmc->mca_addr = im->mca_addr;
725 pmc->mca_crcount = idev->mc_qrv;
726 pmc->mca_sfmode = im->mca_sfmode;
727 if (pmc->mca_sfmode == MCAST_INCLUDE) {
728 struct ip6_sf_list *psf;
729
730 pmc->mca_tomb = im->mca_tomb;
731 pmc->mca_sources = im->mca_sources;
732 im->mca_tomb = im->mca_sources = NULL;
733 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
734 psf->sf_crcount = pmc->mca_crcount;
735 }
736 spin_unlock_bh(&im->mca_lock);
737
738 spin_lock_bh(&idev->mc_lock);
739 pmc->next = idev->mc_tomb;
740 idev->mc_tomb = pmc;
741 spin_unlock_bh(&idev->mc_lock);
742 }
743
744 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
745 {
746 struct ifmcaddr6 *pmc, *pmc_prev;
747 struct ip6_sf_list *psf, *psf_next;
748
749 spin_lock_bh(&idev->mc_lock);
750 pmc_prev = NULL;
751 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
752 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
753 break;
754 pmc_prev = pmc;
755 }
756 if (pmc) {
757 if (pmc_prev)
758 pmc_prev->next = pmc->next;
759 else
760 idev->mc_tomb = pmc->next;
761 }
762 spin_unlock_bh(&idev->mc_lock);
763
764 if (pmc) {
765 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
766 psf_next = psf->sf_next;
767 kfree(psf);
768 }
769 in6_dev_put(pmc->idev);
770 kfree(pmc);
771 }
772 }
773
774 static void mld_clear_delrec(struct inet6_dev *idev)
775 {
776 struct ifmcaddr6 *pmc, *nextpmc;
777
778 spin_lock_bh(&idev->mc_lock);
779 pmc = idev->mc_tomb;
780 idev->mc_tomb = NULL;
781 spin_unlock_bh(&idev->mc_lock);
782
783 for (; pmc; pmc = nextpmc) {
784 nextpmc = pmc->next;
785 ip6_mc_clear_src(pmc);
786 in6_dev_put(pmc->idev);
787 kfree(pmc);
788 }
789
790 /* clear dead sources, too */
791 read_lock_bh(&idev->lock);
792 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
793 struct ip6_sf_list *psf, *psf_next;
794
795 spin_lock_bh(&pmc->mca_lock);
796 psf = pmc->mca_tomb;
797 pmc->mca_tomb = NULL;
798 spin_unlock_bh(&pmc->mca_lock);
799 for (; psf; psf = psf_next) {
800 psf_next = psf->sf_next;
801 kfree(psf);
802 }
803 }
804 read_unlock_bh(&idev->lock);
805 }
806
807 static void mca_get(struct ifmcaddr6 *mc)
808 {
809 atomic_inc(&mc->mca_refcnt);
810 }
811
812 static void ma_put(struct ifmcaddr6 *mc)
813 {
814 if (atomic_dec_and_test(&mc->mca_refcnt)) {
815 in6_dev_put(mc->idev);
816 kfree(mc);
817 }
818 }
819
820 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
821 const struct in6_addr *addr)
822 {
823 struct ifmcaddr6 *mc;
824
825 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
826 if (!mc)
827 return NULL;
828
829 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
830
831 mc->mca_addr = *addr;
832 mc->idev = idev; /* reference taken by caller */
833 mc->mca_users = 1;
834 /* mca_stamp should be updated upon changes */
835 mc->mca_cstamp = mc->mca_tstamp = jiffies;
836 atomic_set(&mc->mca_refcnt, 1);
837 spin_lock_init(&mc->mca_lock);
838
839 /* initial mode is (EX, empty) */
840 mc->mca_sfmode = MCAST_EXCLUDE;
841 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
842
843 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
844 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
845 mc->mca_flags |= MAF_NOREPORT;
846
847 return mc;
848 }
849
850 /*
851 * device multicast group inc (add if not found)
852 */
853 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
854 {
855 struct ifmcaddr6 *mc;
856 struct inet6_dev *idev;
857
858 ASSERT_RTNL();
859
860 /* we need to take a reference on idev */
861 idev = in6_dev_get(dev);
862
863 if (!idev)
864 return -EINVAL;
865
866 write_lock_bh(&idev->lock);
867 if (idev->dead) {
868 write_unlock_bh(&idev->lock);
869 in6_dev_put(idev);
870 return -ENODEV;
871 }
872
873 for (mc = idev->mc_list; mc; mc = mc->next) {
874 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
875 mc->mca_users++;
876 write_unlock_bh(&idev->lock);
877 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
878 NULL, 0);
879 in6_dev_put(idev);
880 return 0;
881 }
882 }
883
884 mc = mca_alloc(idev, addr);
885 if (!mc) {
886 write_unlock_bh(&idev->lock);
887 in6_dev_put(idev);
888 return -ENOMEM;
889 }
890
891 mc->next = idev->mc_list;
892 idev->mc_list = mc;
893
894 /* Hold this for the code below before we unlock,
895 * it is already exposed via idev->mc_list.
896 */
897 mca_get(mc);
898 write_unlock_bh(&idev->lock);
899
900 mld_del_delrec(idev, &mc->mca_addr);
901 igmp6_group_added(mc);
902 ma_put(mc);
903 return 0;
904 }
905
906 /*
907 * device multicast group del
908 */
909 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
910 {
911 struct ifmcaddr6 *ma, **map;
912
913 ASSERT_RTNL();
914
915 write_lock_bh(&idev->lock);
916 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
917 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
918 if (--ma->mca_users == 0) {
919 *map = ma->next;
920 write_unlock_bh(&idev->lock);
921
922 igmp6_group_dropped(ma);
923
924 ma_put(ma);
925 return 0;
926 }
927 write_unlock_bh(&idev->lock);
928 return 0;
929 }
930 }
931 write_unlock_bh(&idev->lock);
932
933 return -ENOENT;
934 }
935
936 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
937 {
938 struct inet6_dev *idev;
939 int err;
940
941 ASSERT_RTNL();
942
943 idev = __in6_dev_get(dev);
944 if (!idev)
945 err = -ENODEV;
946 else
947 err = __ipv6_dev_mc_dec(idev, addr);
948
949 return err;
950 }
951
952 /*
953 * check if the interface/address pair is valid
954 */
955 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
956 const struct in6_addr *src_addr)
957 {
958 struct inet6_dev *idev;
959 struct ifmcaddr6 *mc;
960 bool rv = false;
961
962 rcu_read_lock();
963 idev = __in6_dev_get(dev);
964 if (idev) {
965 read_lock_bh(&idev->lock);
966 for (mc = idev->mc_list; mc; mc = mc->next) {
967 if (ipv6_addr_equal(&mc->mca_addr, group))
968 break;
969 }
970 if (mc) {
971 if (src_addr && !ipv6_addr_any(src_addr)) {
972 struct ip6_sf_list *psf;
973
974 spin_lock_bh(&mc->mca_lock);
975 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
976 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
977 break;
978 }
979 if (psf)
980 rv = psf->sf_count[MCAST_INCLUDE] ||
981 psf->sf_count[MCAST_EXCLUDE] !=
982 mc->mca_sfcount[MCAST_EXCLUDE];
983 else
984 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
985 spin_unlock_bh(&mc->mca_lock);
986 } else
987 rv = true; /* don't filter unspecified source */
988 }
989 read_unlock_bh(&idev->lock);
990 }
991 rcu_read_unlock();
992 return rv;
993 }
994
995 static void mld_gq_start_timer(struct inet6_dev *idev)
996 {
997 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
998
999 idev->mc_gq_running = 1;
1000 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1001 in6_dev_hold(idev);
1002 }
1003
1004 static void mld_gq_stop_timer(struct inet6_dev *idev)
1005 {
1006 idev->mc_gq_running = 0;
1007 if (del_timer(&idev->mc_gq_timer))
1008 __in6_dev_put(idev);
1009 }
1010
1011 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1012 {
1013 unsigned long tv = prandom_u32() % delay;
1014
1015 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016 in6_dev_hold(idev);
1017 }
1018
1019 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1020 {
1021 idev->mc_ifc_count = 0;
1022 if (del_timer(&idev->mc_ifc_timer))
1023 __in6_dev_put(idev);
1024 }
1025
1026 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1027 {
1028 unsigned long tv = prandom_u32() % delay;
1029
1030 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1031 in6_dev_hold(idev);
1032 }
1033
1034 static void mld_dad_stop_timer(struct inet6_dev *idev)
1035 {
1036 if (del_timer(&idev->mc_dad_timer))
1037 __in6_dev_put(idev);
1038 }
1039
1040 /*
1041 * IGMP handling (alias multicast ICMPv6 messages)
1042 */
1043
1044 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1045 {
1046 unsigned long delay = resptime;
1047
1048 /* Do not start timer for these addresses */
1049 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1050 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1051 return;
1052
1053 if (del_timer(&ma->mca_timer)) {
1054 atomic_dec(&ma->mca_refcnt);
1055 delay = ma->mca_timer.expires - jiffies;
1056 }
1057
1058 if (delay >= resptime)
1059 delay = prandom_u32() % resptime;
1060
1061 ma->mca_timer.expires = jiffies + delay;
1062 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1063 atomic_inc(&ma->mca_refcnt);
1064 ma->mca_flags |= MAF_TIMER_RUNNING;
1065 }
1066
1067 /* mark EXCLUDE-mode sources */
1068 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1069 const struct in6_addr *srcs)
1070 {
1071 struct ip6_sf_list *psf;
1072 int i, scount;
1073
1074 scount = 0;
1075 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1076 if (scount == nsrcs)
1077 break;
1078 for (i = 0; i < nsrcs; i++) {
1079 /* skip inactive filters */
1080 if (psf->sf_count[MCAST_INCLUDE] ||
1081 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1082 psf->sf_count[MCAST_EXCLUDE])
1083 break;
1084 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1085 scount++;
1086 break;
1087 }
1088 }
1089 }
1090 pmc->mca_flags &= ~MAF_GSQUERY;
1091 if (scount == nsrcs) /* all sources excluded */
1092 return false;
1093 return true;
1094 }
1095
1096 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1097 const struct in6_addr *srcs)
1098 {
1099 struct ip6_sf_list *psf;
1100 int i, scount;
1101
1102 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1103 return mld_xmarksources(pmc, nsrcs, srcs);
1104
1105 /* mark INCLUDE-mode sources */
1106
1107 scount = 0;
1108 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1109 if (scount == nsrcs)
1110 break;
1111 for (i = 0; i < nsrcs; i++) {
1112 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113 psf->sf_gsresp = 1;
1114 scount++;
1115 break;
1116 }
1117 }
1118 }
1119 if (!scount) {
1120 pmc->mca_flags &= ~MAF_GSQUERY;
1121 return false;
1122 }
1123 pmc->mca_flags |= MAF_GSQUERY;
1124 return true;
1125 }
1126
1127 static int mld_force_mld_version(const struct inet6_dev *idev)
1128 {
1129 /* Normally, both are 0 here. If enforcement to a particular is
1130 * being used, individual device enforcement will have a lower
1131 * precedence over 'all' device (.../conf/all/force_mld_version).
1132 */
1133
1134 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1135 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1136 else
1137 return idev->cnf.force_mld_version;
1138 }
1139
1140 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1141 {
1142 return mld_force_mld_version(idev) == 2;
1143 }
1144
1145 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1146 {
1147 return mld_force_mld_version(idev) == 1;
1148 }
1149
1150 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1151 {
1152 if (mld_in_v2_mode_only(idev))
1153 return false;
1154 if (mld_in_v1_mode_only(idev))
1155 return true;
1156 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1157 return true;
1158
1159 return false;
1160 }
1161
1162 static void mld_set_v1_mode(struct inet6_dev *idev)
1163 {
1164 /* RFC3810, relevant sections:
1165 * - 9.1. Robustness Variable
1166 * - 9.2. Query Interval
1167 * - 9.3. Query Response Interval
1168 * - 9.12. Older Version Querier Present Timeout
1169 */
1170 unsigned long switchback;
1171
1172 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1173
1174 idev->mc_v1_seen = jiffies + switchback;
1175 }
1176
1177 static void mld_update_qrv(struct inet6_dev *idev,
1178 const struct mld2_query *mlh2)
1179 {
1180 /* RFC3810, relevant sections:
1181 * - 5.1.8. QRV (Querier's Robustness Variable)
1182 * - 9.1. Robustness Variable
1183 */
1184
1185 /* The value of the Robustness Variable MUST NOT be zero,
1186 * and SHOULD NOT be one. Catch this here if we ever run
1187 * into such a case in future.
1188 */
1189 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1190 WARN_ON(idev->mc_qrv == 0);
1191
1192 if (mlh2->mld2q_qrv > 0)
1193 idev->mc_qrv = mlh2->mld2q_qrv;
1194
1195 if (unlikely(idev->mc_qrv < min_qrv)) {
1196 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1197 idev->mc_qrv, min_qrv);
1198 idev->mc_qrv = min_qrv;
1199 }
1200 }
1201
1202 static void mld_update_qi(struct inet6_dev *idev,
1203 const struct mld2_query *mlh2)
1204 {
1205 /* RFC3810, relevant sections:
1206 * - 5.1.9. QQIC (Querier's Query Interval Code)
1207 * - 9.2. Query Interval
1208 * - 9.12. Older Version Querier Present Timeout
1209 * (the [Query Interval] in the last Query received)
1210 */
1211 unsigned long mc_qqi;
1212
1213 if (mlh2->mld2q_qqic < 128) {
1214 mc_qqi = mlh2->mld2q_qqic;
1215 } else {
1216 unsigned long mc_man, mc_exp;
1217
1218 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1219 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1220
1221 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1222 }
1223
1224 idev->mc_qi = mc_qqi * HZ;
1225 }
1226
1227 static void mld_update_qri(struct inet6_dev *idev,
1228 const struct mld2_query *mlh2)
1229 {
1230 /* RFC3810, relevant sections:
1231 * - 5.1.3. Maximum Response Code
1232 * - 9.3. Query Response Interval
1233 */
1234 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1235 }
1236
1237 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1238 unsigned long *max_delay, bool v1_query)
1239 {
1240 unsigned long mldv1_md;
1241
1242 /* Ignore v1 queries */
1243 if (mld_in_v2_mode_only(idev))
1244 return -EINVAL;
1245
1246 mldv1_md = ntohs(mld->mld_maxdelay);
1247
1248 /* When in MLDv1 fallback and a MLDv2 router start-up being
1249 * unaware of current MLDv1 operation, the MRC == MRD mapping
1250 * only works when the exponential algorithm is not being
1251 * used (as MLDv1 is unaware of such things).
1252 *
1253 * According to the RFC author, the MLDv2 implementations
1254 * he's aware of all use a MRC < 32768 on start up queries.
1255 *
1256 * Thus, should we *ever* encounter something else larger
1257 * than that, just assume the maximum possible within our
1258 * reach.
1259 */
1260 if (!v1_query)
1261 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1262
1263 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1264
1265 /* MLDv1 router present: we need to go into v1 mode *only*
1266 * when an MLDv1 query is received as per section 9.12. of
1267 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1268 * queries MUST be of exactly 24 octets.
1269 */
1270 if (v1_query)
1271 mld_set_v1_mode(idev);
1272
1273 /* cancel MLDv2 report timer */
1274 mld_gq_stop_timer(idev);
1275 /* cancel the interface change timer */
1276 mld_ifc_stop_timer(idev);
1277 /* clear deleted report items */
1278 mld_clear_delrec(idev);
1279
1280 return 0;
1281 }
1282
1283 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1284 unsigned long *max_delay)
1285 {
1286 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1287
1288 mld_update_qrv(idev, mld);
1289 mld_update_qi(idev, mld);
1290 mld_update_qri(idev, mld);
1291
1292 idev->mc_maxdelay = *max_delay;
1293
1294 return 0;
1295 }
1296
1297 /* called with rcu_read_lock() */
1298 int igmp6_event_query(struct sk_buff *skb)
1299 {
1300 struct mld2_query *mlh2 = NULL;
1301 struct ifmcaddr6 *ma;
1302 const struct in6_addr *group;
1303 unsigned long max_delay;
1304 struct inet6_dev *idev;
1305 struct mld_msg *mld;
1306 int group_type;
1307 int mark = 0;
1308 int len, err;
1309
1310 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1311 return -EINVAL;
1312
1313 /* compute payload length excluding extension headers */
1314 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1315 len -= skb_network_header_len(skb);
1316
1317 /* RFC3810 6.2
1318 * Upon reception of an MLD message that contains a Query, the node
1319 * checks if the source address of the message is a valid link-local
1320 * address, if the Hop Limit is set to 1, and if the Router Alert
1321 * option is present in the Hop-By-Hop Options header of the IPv6
1322 * packet. If any of these checks fails, the packet is dropped.
1323 */
1324 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1325 ipv6_hdr(skb)->hop_limit != 1 ||
1326 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1327 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1328 return -EINVAL;
1329
1330 idev = __in6_dev_get(skb->dev);
1331 if (!idev)
1332 return 0;
1333
1334 mld = (struct mld_msg *)icmp6_hdr(skb);
1335 group = &mld->mld_mca;
1336 group_type = ipv6_addr_type(group);
1337
1338 if (group_type != IPV6_ADDR_ANY &&
1339 !(group_type&IPV6_ADDR_MULTICAST))
1340 return -EINVAL;
1341
1342 if (len < MLD_V1_QUERY_LEN) {
1343 return -EINVAL;
1344 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1345 err = mld_process_v1(idev, mld, &max_delay,
1346 len == MLD_V1_QUERY_LEN);
1347 if (err < 0)
1348 return err;
1349 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1350 int srcs_offset = sizeof(struct mld2_query) -
1351 sizeof(struct icmp6hdr);
1352
1353 if (!pskb_may_pull(skb, srcs_offset))
1354 return -EINVAL;
1355
1356 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1357
1358 err = mld_process_v2(idev, mlh2, &max_delay);
1359 if (err < 0)
1360 return err;
1361
1362 if (group_type == IPV6_ADDR_ANY) { /* general query */
1363 if (mlh2->mld2q_nsrcs)
1364 return -EINVAL; /* no sources allowed */
1365
1366 mld_gq_start_timer(idev);
1367 return 0;
1368 }
1369 /* mark sources to include, if group & source-specific */
1370 if (mlh2->mld2q_nsrcs != 0) {
1371 if (!pskb_may_pull(skb, srcs_offset +
1372 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1373 return -EINVAL;
1374
1375 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1376 mark = 1;
1377 }
1378 } else {
1379 return -EINVAL;
1380 }
1381
1382 read_lock_bh(&idev->lock);
1383 if (group_type == IPV6_ADDR_ANY) {
1384 for (ma = idev->mc_list; ma; ma = ma->next) {
1385 spin_lock_bh(&ma->mca_lock);
1386 igmp6_group_queried(ma, max_delay);
1387 spin_unlock_bh(&ma->mca_lock);
1388 }
1389 } else {
1390 for (ma = idev->mc_list; ma; ma = ma->next) {
1391 if (!ipv6_addr_equal(group, &ma->mca_addr))
1392 continue;
1393 spin_lock_bh(&ma->mca_lock);
1394 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1395 /* gsquery <- gsquery && mark */
1396 if (!mark)
1397 ma->mca_flags &= ~MAF_GSQUERY;
1398 } else {
1399 /* gsquery <- mark */
1400 if (mark)
1401 ma->mca_flags |= MAF_GSQUERY;
1402 else
1403 ma->mca_flags &= ~MAF_GSQUERY;
1404 }
1405 if (!(ma->mca_flags & MAF_GSQUERY) ||
1406 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1407 igmp6_group_queried(ma, max_delay);
1408 spin_unlock_bh(&ma->mca_lock);
1409 break;
1410 }
1411 }
1412 read_unlock_bh(&idev->lock);
1413
1414 return 0;
1415 }
1416
1417 /* called with rcu_read_lock() */
1418 int igmp6_event_report(struct sk_buff *skb)
1419 {
1420 struct ifmcaddr6 *ma;
1421 struct inet6_dev *idev;
1422 struct mld_msg *mld;
1423 int addr_type;
1424
1425 /* Our own report looped back. Ignore it. */
1426 if (skb->pkt_type == PACKET_LOOPBACK)
1427 return 0;
1428
1429 /* send our report if the MC router may not have heard this report */
1430 if (skb->pkt_type != PACKET_MULTICAST &&
1431 skb->pkt_type != PACKET_BROADCAST)
1432 return 0;
1433
1434 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1435 return -EINVAL;
1436
1437 mld = (struct mld_msg *)icmp6_hdr(skb);
1438
1439 /* Drop reports with not link local source */
1440 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1441 if (addr_type != IPV6_ADDR_ANY &&
1442 !(addr_type&IPV6_ADDR_LINKLOCAL))
1443 return -EINVAL;
1444
1445 idev = __in6_dev_get(skb->dev);
1446 if (!idev)
1447 return -ENODEV;
1448
1449 /*
1450 * Cancel the timer for this group
1451 */
1452
1453 read_lock_bh(&idev->lock);
1454 for (ma = idev->mc_list; ma; ma = ma->next) {
1455 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1456 spin_lock(&ma->mca_lock);
1457 if (del_timer(&ma->mca_timer))
1458 atomic_dec(&ma->mca_refcnt);
1459 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1460 spin_unlock(&ma->mca_lock);
1461 break;
1462 }
1463 }
1464 read_unlock_bh(&idev->lock);
1465 return 0;
1466 }
1467
1468 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1469 int gdeleted, int sdeleted)
1470 {
1471 switch (type) {
1472 case MLD2_MODE_IS_INCLUDE:
1473 case MLD2_MODE_IS_EXCLUDE:
1474 if (gdeleted || sdeleted)
1475 return false;
1476 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1477 if (pmc->mca_sfmode == MCAST_INCLUDE)
1478 return true;
1479 /* don't include if this source is excluded
1480 * in all filters
1481 */
1482 if (psf->sf_count[MCAST_INCLUDE])
1483 return type == MLD2_MODE_IS_INCLUDE;
1484 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1485 psf->sf_count[MCAST_EXCLUDE];
1486 }
1487 return false;
1488 case MLD2_CHANGE_TO_INCLUDE:
1489 if (gdeleted || sdeleted)
1490 return false;
1491 return psf->sf_count[MCAST_INCLUDE] != 0;
1492 case MLD2_CHANGE_TO_EXCLUDE:
1493 if (gdeleted || sdeleted)
1494 return false;
1495 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1496 psf->sf_count[MCAST_INCLUDE])
1497 return false;
1498 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1499 psf->sf_count[MCAST_EXCLUDE];
1500 case MLD2_ALLOW_NEW_SOURCES:
1501 if (gdeleted || !psf->sf_crcount)
1502 return false;
1503 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1504 case MLD2_BLOCK_OLD_SOURCES:
1505 if (pmc->mca_sfmode == MCAST_INCLUDE)
1506 return gdeleted || (psf->sf_crcount && sdeleted);
1507 return psf->sf_crcount && !gdeleted && !sdeleted;
1508 }
1509 return false;
1510 }
1511
1512 static int
1513 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1514 {
1515 struct ip6_sf_list *psf;
1516 int scount = 0;
1517
1518 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1519 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1520 continue;
1521 scount++;
1522 }
1523 return scount;
1524 }
1525
1526 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1527 struct net_device *dev,
1528 const struct in6_addr *saddr,
1529 const struct in6_addr *daddr,
1530 int proto, int len)
1531 {
1532 struct ipv6hdr *hdr;
1533
1534 skb->protocol = htons(ETH_P_IPV6);
1535 skb->dev = dev;
1536
1537 skb_reset_network_header(skb);
1538 skb_put(skb, sizeof(struct ipv6hdr));
1539 hdr = ipv6_hdr(skb);
1540
1541 ip6_flow_hdr(hdr, 0, 0);
1542
1543 hdr->payload_len = htons(len);
1544 hdr->nexthdr = proto;
1545 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1546
1547 hdr->saddr = *saddr;
1548 hdr->daddr = *daddr;
1549 }
1550
1551 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1552 {
1553 struct net_device *dev = idev->dev;
1554 struct net *net = dev_net(dev);
1555 struct sock *sk = net->ipv6.igmp_sk;
1556 struct sk_buff *skb;
1557 struct mld2_report *pmr;
1558 struct in6_addr addr_buf;
1559 const struct in6_addr *saddr;
1560 int hlen = LL_RESERVED_SPACE(dev);
1561 int tlen = dev->needed_tailroom;
1562 unsigned int size = mtu + hlen + tlen;
1563 int err;
1564 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1565 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1566 IPV6_TLV_PADN, 0 };
1567
1568 /* we assume size > sizeof(ra) here */
1569 /* limit our allocations to order-0 page */
1570 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1571 skb = sock_alloc_send_skb(sk, size, 1, &err);
1572
1573 if (!skb)
1574 return NULL;
1575
1576 skb->priority = TC_PRIO_CONTROL;
1577 skb->reserved_tailroom = skb_end_offset(skb) -
1578 min(mtu, skb_end_offset(skb));
1579 skb_reserve(skb, hlen);
1580
1581 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1582 /* <draft-ietf-magma-mld-source-05.txt>:
1583 * use unspecified address as the source address
1584 * when a valid link-local address is not available.
1585 */
1586 saddr = &in6addr_any;
1587 } else
1588 saddr = &addr_buf;
1589
1590 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1591
1592 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1593
1594 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1595 skb_put(skb, sizeof(*pmr));
1596 pmr = (struct mld2_report *)skb_transport_header(skb);
1597 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1598 pmr->mld2r_resv1 = 0;
1599 pmr->mld2r_cksum = 0;
1600 pmr->mld2r_resv2 = 0;
1601 pmr->mld2r_ngrec = 0;
1602 return skb;
1603 }
1604
1605 static void mld_sendpack(struct sk_buff *skb)
1606 {
1607 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1608 struct mld2_report *pmr =
1609 (struct mld2_report *)skb_transport_header(skb);
1610 int payload_len, mldlen;
1611 struct inet6_dev *idev;
1612 struct net *net = dev_net(skb->dev);
1613 int err;
1614 struct flowi6 fl6;
1615 struct dst_entry *dst;
1616
1617 rcu_read_lock();
1618 idev = __in6_dev_get(skb->dev);
1619 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1620
1621 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1622 sizeof(*pip6);
1623 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1624 pip6->payload_len = htons(payload_len);
1625
1626 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1627 IPPROTO_ICMPV6,
1628 csum_partial(skb_transport_header(skb),
1629 mldlen, 0));
1630
1631 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1632 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1633 skb->dev->ifindex);
1634 dst = icmp6_dst_alloc(skb->dev, &fl6);
1635
1636 err = 0;
1637 if (IS_ERR(dst)) {
1638 err = PTR_ERR(dst);
1639 dst = NULL;
1640 }
1641 skb_dst_set(skb, dst);
1642 if (err)
1643 goto err_out;
1644
1645 payload_len = skb->len;
1646
1647 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1648 net->ipv6.igmp_sk, skb, NULL, skb->dev,
1649 dst_output_sk);
1650 out:
1651 if (!err) {
1652 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1653 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1654 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1655 } else {
1656 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1657 }
1658
1659 rcu_read_unlock();
1660 return;
1661
1662 err_out:
1663 kfree_skb(skb);
1664 goto out;
1665 }
1666
1667 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1668 {
1669 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1670 }
1671
1672 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1673 int type, struct mld2_grec **ppgr)
1674 {
1675 struct net_device *dev = pmc->idev->dev;
1676 struct mld2_report *pmr;
1677 struct mld2_grec *pgr;
1678
1679 if (!skb)
1680 skb = mld_newpack(pmc->idev, dev->mtu);
1681 if (!skb)
1682 return NULL;
1683 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1684 pgr->grec_type = type;
1685 pgr->grec_auxwords = 0;
1686 pgr->grec_nsrcs = 0;
1687 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1688 pmr = (struct mld2_report *)skb_transport_header(skb);
1689 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1690 *ppgr = pgr;
1691 return skb;
1692 }
1693
1694 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1695
1696 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1697 int type, int gdeleted, int sdeleted, int crsend)
1698 {
1699 struct inet6_dev *idev = pmc->idev;
1700 struct net_device *dev = idev->dev;
1701 struct mld2_report *pmr;
1702 struct mld2_grec *pgr = NULL;
1703 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1704 int scount, stotal, first, isquery, truncate;
1705
1706 if (pmc->mca_flags & MAF_NOREPORT)
1707 return skb;
1708
1709 isquery = type == MLD2_MODE_IS_INCLUDE ||
1710 type == MLD2_MODE_IS_EXCLUDE;
1711 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1712 type == MLD2_CHANGE_TO_EXCLUDE;
1713
1714 stotal = scount = 0;
1715
1716 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1717
1718 if (!*psf_list)
1719 goto empty_source;
1720
1721 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1722
1723 /* EX and TO_EX get a fresh packet, if needed */
1724 if (truncate) {
1725 if (pmr && pmr->mld2r_ngrec &&
1726 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1727 if (skb)
1728 mld_sendpack(skb);
1729 skb = mld_newpack(idev, dev->mtu);
1730 }
1731 }
1732 first = 1;
1733 psf_prev = NULL;
1734 for (psf = *psf_list; psf; psf = psf_next) {
1735 struct in6_addr *psrc;
1736
1737 psf_next = psf->sf_next;
1738
1739 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1740 psf_prev = psf;
1741 continue;
1742 }
1743
1744 /* clear marks on query responses */
1745 if (isquery)
1746 psf->sf_gsresp = 0;
1747
1748 if (AVAILABLE(skb) < sizeof(*psrc) +
1749 first*sizeof(struct mld2_grec)) {
1750 if (truncate && !first)
1751 break; /* truncate these */
1752 if (pgr)
1753 pgr->grec_nsrcs = htons(scount);
1754 if (skb)
1755 mld_sendpack(skb);
1756 skb = mld_newpack(idev, dev->mtu);
1757 first = 1;
1758 scount = 0;
1759 }
1760 if (first) {
1761 skb = add_grhead(skb, pmc, type, &pgr);
1762 first = 0;
1763 }
1764 if (!skb)
1765 return NULL;
1766 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1767 *psrc = psf->sf_addr;
1768 scount++; stotal++;
1769 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1770 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1771 psf->sf_crcount--;
1772 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1773 if (psf_prev)
1774 psf_prev->sf_next = psf->sf_next;
1775 else
1776 *psf_list = psf->sf_next;
1777 kfree(psf);
1778 continue;
1779 }
1780 }
1781 psf_prev = psf;
1782 }
1783
1784 empty_source:
1785 if (!stotal) {
1786 if (type == MLD2_ALLOW_NEW_SOURCES ||
1787 type == MLD2_BLOCK_OLD_SOURCES)
1788 return skb;
1789 if (pmc->mca_crcount || isquery || crsend) {
1790 /* make sure we have room for group header */
1791 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1792 mld_sendpack(skb);
1793 skb = NULL; /* add_grhead will get a new one */
1794 }
1795 skb = add_grhead(skb, pmc, type, &pgr);
1796 }
1797 }
1798 if (pgr)
1799 pgr->grec_nsrcs = htons(scount);
1800
1801 if (isquery)
1802 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1803 return skb;
1804 }
1805
1806 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1807 {
1808 struct sk_buff *skb = NULL;
1809 int type;
1810
1811 read_lock_bh(&idev->lock);
1812 if (!pmc) {
1813 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1814 if (pmc->mca_flags & MAF_NOREPORT)
1815 continue;
1816 spin_lock_bh(&pmc->mca_lock);
1817 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1818 type = MLD2_MODE_IS_EXCLUDE;
1819 else
1820 type = MLD2_MODE_IS_INCLUDE;
1821 skb = add_grec(skb, pmc, type, 0, 0, 0);
1822 spin_unlock_bh(&pmc->mca_lock);
1823 }
1824 } else {
1825 spin_lock_bh(&pmc->mca_lock);
1826 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1827 type = MLD2_MODE_IS_EXCLUDE;
1828 else
1829 type = MLD2_MODE_IS_INCLUDE;
1830 skb = add_grec(skb, pmc, type, 0, 0, 0);
1831 spin_unlock_bh(&pmc->mca_lock);
1832 }
1833 read_unlock_bh(&idev->lock);
1834 if (skb)
1835 mld_sendpack(skb);
1836 }
1837
1838 /*
1839 * remove zero-count source records from a source filter list
1840 */
1841 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1842 {
1843 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1844
1845 psf_prev = NULL;
1846 for (psf = *ppsf; psf; psf = psf_next) {
1847 psf_next = psf->sf_next;
1848 if (psf->sf_crcount == 0) {
1849 if (psf_prev)
1850 psf_prev->sf_next = psf->sf_next;
1851 else
1852 *ppsf = psf->sf_next;
1853 kfree(psf);
1854 } else
1855 psf_prev = psf;
1856 }
1857 }
1858
1859 static void mld_send_cr(struct inet6_dev *idev)
1860 {
1861 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1862 struct sk_buff *skb = NULL;
1863 int type, dtype;
1864
1865 read_lock_bh(&idev->lock);
1866 spin_lock(&idev->mc_lock);
1867
1868 /* deleted MCA's */
1869 pmc_prev = NULL;
1870 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1871 pmc_next = pmc->next;
1872 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1873 type = MLD2_BLOCK_OLD_SOURCES;
1874 dtype = MLD2_BLOCK_OLD_SOURCES;
1875 skb = add_grec(skb, pmc, type, 1, 0, 0);
1876 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1877 }
1878 if (pmc->mca_crcount) {
1879 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1880 type = MLD2_CHANGE_TO_INCLUDE;
1881 skb = add_grec(skb, pmc, type, 1, 0, 0);
1882 }
1883 pmc->mca_crcount--;
1884 if (pmc->mca_crcount == 0) {
1885 mld_clear_zeros(&pmc->mca_tomb);
1886 mld_clear_zeros(&pmc->mca_sources);
1887 }
1888 }
1889 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1890 !pmc->mca_sources) {
1891 if (pmc_prev)
1892 pmc_prev->next = pmc_next;
1893 else
1894 idev->mc_tomb = pmc_next;
1895 in6_dev_put(pmc->idev);
1896 kfree(pmc);
1897 } else
1898 pmc_prev = pmc;
1899 }
1900 spin_unlock(&idev->mc_lock);
1901
1902 /* change recs */
1903 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1904 spin_lock_bh(&pmc->mca_lock);
1905 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1906 type = MLD2_BLOCK_OLD_SOURCES;
1907 dtype = MLD2_ALLOW_NEW_SOURCES;
1908 } else {
1909 type = MLD2_ALLOW_NEW_SOURCES;
1910 dtype = MLD2_BLOCK_OLD_SOURCES;
1911 }
1912 skb = add_grec(skb, pmc, type, 0, 0, 0);
1913 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1914
1915 /* filter mode changes */
1916 if (pmc->mca_crcount) {
1917 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1918 type = MLD2_CHANGE_TO_EXCLUDE;
1919 else
1920 type = MLD2_CHANGE_TO_INCLUDE;
1921 skb = add_grec(skb, pmc, type, 0, 0, 0);
1922 pmc->mca_crcount--;
1923 }
1924 spin_unlock_bh(&pmc->mca_lock);
1925 }
1926 read_unlock_bh(&idev->lock);
1927 if (!skb)
1928 return;
1929 (void) mld_sendpack(skb);
1930 }
1931
1932 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1933 {
1934 struct net *net = dev_net(dev);
1935 struct sock *sk = net->ipv6.igmp_sk;
1936 struct inet6_dev *idev;
1937 struct sk_buff *skb;
1938 struct mld_msg *hdr;
1939 const struct in6_addr *snd_addr, *saddr;
1940 struct in6_addr addr_buf;
1941 int hlen = LL_RESERVED_SPACE(dev);
1942 int tlen = dev->needed_tailroom;
1943 int err, len, payload_len, full_len;
1944 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1945 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1946 IPV6_TLV_PADN, 0 };
1947 struct flowi6 fl6;
1948 struct dst_entry *dst;
1949
1950 if (type == ICMPV6_MGM_REDUCTION)
1951 snd_addr = &in6addr_linklocal_allrouters;
1952 else
1953 snd_addr = addr;
1954
1955 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1956 payload_len = len + sizeof(ra);
1957 full_len = sizeof(struct ipv6hdr) + payload_len;
1958
1959 rcu_read_lock();
1960 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1961 IPSTATS_MIB_OUT, full_len);
1962 rcu_read_unlock();
1963
1964 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1965
1966 if (!skb) {
1967 rcu_read_lock();
1968 IP6_INC_STATS(net, __in6_dev_get(dev),
1969 IPSTATS_MIB_OUTDISCARDS);
1970 rcu_read_unlock();
1971 return;
1972 }
1973 skb->priority = TC_PRIO_CONTROL;
1974 skb_reserve(skb, hlen);
1975
1976 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1977 /* <draft-ietf-magma-mld-source-05.txt>:
1978 * use unspecified address as the source address
1979 * when a valid link-local address is not available.
1980 */
1981 saddr = &in6addr_any;
1982 } else
1983 saddr = &addr_buf;
1984
1985 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1986
1987 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1988
1989 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1990 memset(hdr, 0, sizeof(struct mld_msg));
1991 hdr->mld_type = type;
1992 hdr->mld_mca = *addr;
1993
1994 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1995 IPPROTO_ICMPV6,
1996 csum_partial(hdr, len, 0));
1997
1998 rcu_read_lock();
1999 idev = __in6_dev_get(skb->dev);
2000
2001 icmpv6_flow_init(sk, &fl6, type,
2002 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2003 skb->dev->ifindex);
2004 dst = icmp6_dst_alloc(skb->dev, &fl6);
2005 if (IS_ERR(dst)) {
2006 err = PTR_ERR(dst);
2007 goto err_out;
2008 }
2009
2010 skb_dst_set(skb, dst);
2011 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,
2012 NULL, skb->dev, dst_output_sk);
2013 out:
2014 if (!err) {
2015 ICMP6MSGOUT_INC_STATS(net, idev, type);
2016 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2017 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2018 } else
2019 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2020
2021 rcu_read_unlock();
2022 return;
2023
2024 err_out:
2025 kfree_skb(skb);
2026 goto out;
2027 }
2028
2029 static void mld_send_initial_cr(struct inet6_dev *idev)
2030 {
2031 struct sk_buff *skb;
2032 struct ifmcaddr6 *pmc;
2033 int type;
2034
2035 if (mld_in_v1_mode(idev))
2036 return;
2037
2038 skb = NULL;
2039 read_lock_bh(&idev->lock);
2040 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2041 spin_lock_bh(&pmc->mca_lock);
2042 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2043 type = MLD2_CHANGE_TO_EXCLUDE;
2044 else
2045 type = MLD2_CHANGE_TO_INCLUDE;
2046 skb = add_grec(skb, pmc, type, 0, 0, 1);
2047 spin_unlock_bh(&pmc->mca_lock);
2048 }
2049 read_unlock_bh(&idev->lock);
2050 if (skb)
2051 mld_sendpack(skb);
2052 }
2053
2054 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2055 {
2056 idev->mc_dad_count = idev->mc_qrv;
2057 if (idev->mc_dad_count) {
2058 mld_send_initial_cr(idev);
2059 idev->mc_dad_count--;
2060 if (idev->mc_dad_count)
2061 mld_dad_start_timer(idev, idev->mc_maxdelay);
2062 }
2063 }
2064
2065 static void mld_dad_timer_expire(unsigned long data)
2066 {
2067 struct inet6_dev *idev = (struct inet6_dev *)data;
2068
2069 mld_send_initial_cr(idev);
2070 if (idev->mc_dad_count) {
2071 idev->mc_dad_count--;
2072 if (idev->mc_dad_count)
2073 mld_dad_start_timer(idev, idev->mc_maxdelay);
2074 }
2075 in6_dev_put(idev);
2076 }
2077
2078 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2079 const struct in6_addr *psfsrc)
2080 {
2081 struct ip6_sf_list *psf, *psf_prev;
2082 int rv = 0;
2083
2084 psf_prev = NULL;
2085 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2086 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2087 break;
2088 psf_prev = psf;
2089 }
2090 if (!psf || psf->sf_count[sfmode] == 0) {
2091 /* source filter not found, or count wrong => bug */
2092 return -ESRCH;
2093 }
2094 psf->sf_count[sfmode]--;
2095 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2096 struct inet6_dev *idev = pmc->idev;
2097
2098 /* no more filters for this source */
2099 if (psf_prev)
2100 psf_prev->sf_next = psf->sf_next;
2101 else
2102 pmc->mca_sources = psf->sf_next;
2103 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2104 !mld_in_v1_mode(idev)) {
2105 psf->sf_crcount = idev->mc_qrv;
2106 psf->sf_next = pmc->mca_tomb;
2107 pmc->mca_tomb = psf;
2108 rv = 1;
2109 } else
2110 kfree(psf);
2111 }
2112 return rv;
2113 }
2114
2115 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2116 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2117 int delta)
2118 {
2119 struct ifmcaddr6 *pmc;
2120 int changerec = 0;
2121 int i, err;
2122
2123 if (!idev)
2124 return -ENODEV;
2125 read_lock_bh(&idev->lock);
2126 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2127 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2128 break;
2129 }
2130 if (!pmc) {
2131 /* MCA not found?? bug */
2132 read_unlock_bh(&idev->lock);
2133 return -ESRCH;
2134 }
2135 spin_lock_bh(&pmc->mca_lock);
2136 sf_markstate(pmc);
2137 if (!delta) {
2138 if (!pmc->mca_sfcount[sfmode]) {
2139 spin_unlock_bh(&pmc->mca_lock);
2140 read_unlock_bh(&idev->lock);
2141 return -EINVAL;
2142 }
2143 pmc->mca_sfcount[sfmode]--;
2144 }
2145 err = 0;
2146 for (i = 0; i < sfcount; i++) {
2147 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2148
2149 changerec |= rv > 0;
2150 if (!err && rv < 0)
2151 err = rv;
2152 }
2153 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2154 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2155 pmc->mca_sfcount[MCAST_INCLUDE]) {
2156 struct ip6_sf_list *psf;
2157
2158 /* filter mode change */
2159 pmc->mca_sfmode = MCAST_INCLUDE;
2160 pmc->mca_crcount = idev->mc_qrv;
2161 idev->mc_ifc_count = pmc->mca_crcount;
2162 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2163 psf->sf_crcount = 0;
2164 mld_ifc_event(pmc->idev);
2165 } else if (sf_setstate(pmc) || changerec)
2166 mld_ifc_event(pmc->idev);
2167 spin_unlock_bh(&pmc->mca_lock);
2168 read_unlock_bh(&idev->lock);
2169 return err;
2170 }
2171
2172 /*
2173 * Add multicast single-source filter to the interface list
2174 */
2175 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2176 const struct in6_addr *psfsrc)
2177 {
2178 struct ip6_sf_list *psf, *psf_prev;
2179
2180 psf_prev = NULL;
2181 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2182 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2183 break;
2184 psf_prev = psf;
2185 }
2186 if (!psf) {
2187 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2188 if (!psf)
2189 return -ENOBUFS;
2190
2191 psf->sf_addr = *psfsrc;
2192 if (psf_prev) {
2193 psf_prev->sf_next = psf;
2194 } else
2195 pmc->mca_sources = psf;
2196 }
2197 psf->sf_count[sfmode]++;
2198 return 0;
2199 }
2200
2201 static void sf_markstate(struct ifmcaddr6 *pmc)
2202 {
2203 struct ip6_sf_list *psf;
2204 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2205
2206 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2207 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2208 psf->sf_oldin = mca_xcount ==
2209 psf->sf_count[MCAST_EXCLUDE] &&
2210 !psf->sf_count[MCAST_INCLUDE];
2211 } else
2212 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2213 }
2214
2215 static int sf_setstate(struct ifmcaddr6 *pmc)
2216 {
2217 struct ip6_sf_list *psf, *dpsf;
2218 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2219 int qrv = pmc->idev->mc_qrv;
2220 int new_in, rv;
2221
2222 rv = 0;
2223 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2224 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2225 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2226 !psf->sf_count[MCAST_INCLUDE];
2227 } else
2228 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2229 if (new_in) {
2230 if (!psf->sf_oldin) {
2231 struct ip6_sf_list *prev = NULL;
2232
2233 for (dpsf = pmc->mca_tomb; dpsf;
2234 dpsf = dpsf->sf_next) {
2235 if (ipv6_addr_equal(&dpsf->sf_addr,
2236 &psf->sf_addr))
2237 break;
2238 prev = dpsf;
2239 }
2240 if (dpsf) {
2241 if (prev)
2242 prev->sf_next = dpsf->sf_next;
2243 else
2244 pmc->mca_tomb = dpsf->sf_next;
2245 kfree(dpsf);
2246 }
2247 psf->sf_crcount = qrv;
2248 rv++;
2249 }
2250 } else if (psf->sf_oldin) {
2251 psf->sf_crcount = 0;
2252 /*
2253 * add or update "delete" records if an active filter
2254 * is now inactive
2255 */
2256 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2257 if (ipv6_addr_equal(&dpsf->sf_addr,
2258 &psf->sf_addr))
2259 break;
2260 if (!dpsf) {
2261 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2262 if (!dpsf)
2263 continue;
2264 *dpsf = *psf;
2265 /* pmc->mca_lock held by callers */
2266 dpsf->sf_next = pmc->mca_tomb;
2267 pmc->mca_tomb = dpsf;
2268 }
2269 dpsf->sf_crcount = qrv;
2270 rv++;
2271 }
2272 }
2273 return rv;
2274 }
2275
2276 /*
2277 * Add multicast source filter list to the interface list
2278 */
2279 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2280 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2281 int delta)
2282 {
2283 struct ifmcaddr6 *pmc;
2284 int isexclude;
2285 int i, err;
2286
2287 if (!idev)
2288 return -ENODEV;
2289 read_lock_bh(&idev->lock);
2290 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2291 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2292 break;
2293 }
2294 if (!pmc) {
2295 /* MCA not found?? bug */
2296 read_unlock_bh(&idev->lock);
2297 return -ESRCH;
2298 }
2299 spin_lock_bh(&pmc->mca_lock);
2300
2301 sf_markstate(pmc);
2302 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2303 if (!delta)
2304 pmc->mca_sfcount[sfmode]++;
2305 err = 0;
2306 for (i = 0; i < sfcount; i++) {
2307 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2308 if (err)
2309 break;
2310 }
2311 if (err) {
2312 int j;
2313
2314 if (!delta)
2315 pmc->mca_sfcount[sfmode]--;
2316 for (j = 0; j < i; j++)
2317 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2318 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2319 struct ip6_sf_list *psf;
2320
2321 /* filter mode change */
2322 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2323 pmc->mca_sfmode = MCAST_EXCLUDE;
2324 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2325 pmc->mca_sfmode = MCAST_INCLUDE;
2326 /* else no filters; keep old mode for reports */
2327
2328 pmc->mca_crcount = idev->mc_qrv;
2329 idev->mc_ifc_count = pmc->mca_crcount;
2330 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2331 psf->sf_crcount = 0;
2332 mld_ifc_event(idev);
2333 } else if (sf_setstate(pmc))
2334 mld_ifc_event(idev);
2335 spin_unlock_bh(&pmc->mca_lock);
2336 read_unlock_bh(&idev->lock);
2337 return err;
2338 }
2339
2340 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2341 {
2342 struct ip6_sf_list *psf, *nextpsf;
2343
2344 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2345 nextpsf = psf->sf_next;
2346 kfree(psf);
2347 }
2348 pmc->mca_tomb = NULL;
2349 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2350 nextpsf = psf->sf_next;
2351 kfree(psf);
2352 }
2353 pmc->mca_sources = NULL;
2354 pmc->mca_sfmode = MCAST_EXCLUDE;
2355 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2356 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2357 }
2358
2359
2360 static void igmp6_join_group(struct ifmcaddr6 *ma)
2361 {
2362 unsigned long delay;
2363
2364 if (ma->mca_flags & MAF_NOREPORT)
2365 return;
2366
2367 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2368
2369 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2370
2371 spin_lock_bh(&ma->mca_lock);
2372 if (del_timer(&ma->mca_timer)) {
2373 atomic_dec(&ma->mca_refcnt);
2374 delay = ma->mca_timer.expires - jiffies;
2375 }
2376
2377 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2378 atomic_inc(&ma->mca_refcnt);
2379 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2380 spin_unlock_bh(&ma->mca_lock);
2381 }
2382
2383 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2384 struct inet6_dev *idev)
2385 {
2386 int err;
2387
2388 /* callers have the socket lock and rtnl lock
2389 * so no other readers or writers of iml or its sflist
2390 */
2391 if (!iml->sflist) {
2392 /* any-source empty exclude case */
2393 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2394 }
2395 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2396 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2397 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2398 iml->sflist = NULL;
2399 return err;
2400 }
2401
2402 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2403 {
2404 if (mld_in_v1_mode(ma->idev)) {
2405 if (ma->mca_flags & MAF_LAST_REPORTER)
2406 igmp6_send(&ma->mca_addr, ma->idev->dev,
2407 ICMPV6_MGM_REDUCTION);
2408 } else {
2409 mld_add_delrec(ma->idev, ma);
2410 mld_ifc_event(ma->idev);
2411 }
2412 }
2413
2414 static void mld_gq_timer_expire(unsigned long data)
2415 {
2416 struct inet6_dev *idev = (struct inet6_dev *)data;
2417
2418 idev->mc_gq_running = 0;
2419 mld_send_report(idev, NULL);
2420 in6_dev_put(idev);
2421 }
2422
2423 static void mld_ifc_timer_expire(unsigned long data)
2424 {
2425 struct inet6_dev *idev = (struct inet6_dev *)data;
2426
2427 mld_send_cr(idev);
2428 if (idev->mc_ifc_count) {
2429 idev->mc_ifc_count--;
2430 if (idev->mc_ifc_count)
2431 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2432 }
2433 in6_dev_put(idev);
2434 }
2435
2436 static void mld_ifc_event(struct inet6_dev *idev)
2437 {
2438 if (mld_in_v1_mode(idev))
2439 return;
2440 idev->mc_ifc_count = idev->mc_qrv;
2441 mld_ifc_start_timer(idev, 1);
2442 }
2443
2444
2445 static void igmp6_timer_handler(unsigned long data)
2446 {
2447 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2448
2449 if (mld_in_v1_mode(ma->idev))
2450 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2451 else
2452 mld_send_report(ma->idev, ma);
2453
2454 spin_lock(&ma->mca_lock);
2455 ma->mca_flags |= MAF_LAST_REPORTER;
2456 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2457 spin_unlock(&ma->mca_lock);
2458 ma_put(ma);
2459 }
2460
2461 /* Device changing type */
2462
2463 void ipv6_mc_unmap(struct inet6_dev *idev)
2464 {
2465 struct ifmcaddr6 *i;
2466
2467 /* Install multicast list, except for all-nodes (already installed) */
2468
2469 read_lock_bh(&idev->lock);
2470 for (i = idev->mc_list; i; i = i->next)
2471 igmp6_group_dropped(i);
2472 read_unlock_bh(&idev->lock);
2473 }
2474
2475 void ipv6_mc_remap(struct inet6_dev *idev)
2476 {
2477 ipv6_mc_up(idev);
2478 }
2479
2480 /* Device going down */
2481
2482 void ipv6_mc_down(struct inet6_dev *idev)
2483 {
2484 struct ifmcaddr6 *i;
2485
2486 /* Withdraw multicast list */
2487
2488 read_lock_bh(&idev->lock);
2489 mld_ifc_stop_timer(idev);
2490 mld_gq_stop_timer(idev);
2491 mld_dad_stop_timer(idev);
2492
2493 for (i = idev->mc_list; i; i = i->next)
2494 igmp6_group_dropped(i);
2495 read_unlock_bh(&idev->lock);
2496
2497 mld_clear_delrec(idev);
2498 }
2499
2500 static void ipv6_mc_reset(struct inet6_dev *idev)
2501 {
2502 idev->mc_qrv = sysctl_mld_qrv;
2503 idev->mc_qi = MLD_QI_DEFAULT;
2504 idev->mc_qri = MLD_QRI_DEFAULT;
2505 idev->mc_v1_seen = 0;
2506 idev->mc_maxdelay = unsolicited_report_interval(idev);
2507 }
2508
2509 /* Device going up */
2510
2511 void ipv6_mc_up(struct inet6_dev *idev)
2512 {
2513 struct ifmcaddr6 *i;
2514
2515 /* Install multicast list, except for all-nodes (already installed) */
2516
2517 read_lock_bh(&idev->lock);
2518 ipv6_mc_reset(idev);
2519 for (i = idev->mc_list; i; i = i->next)
2520 igmp6_group_added(i);
2521 read_unlock_bh(&idev->lock);
2522 }
2523
2524 /* IPv6 device initialization. */
2525
2526 void ipv6_mc_init_dev(struct inet6_dev *idev)
2527 {
2528 write_lock_bh(&idev->lock);
2529 spin_lock_init(&idev->mc_lock);
2530 idev->mc_gq_running = 0;
2531 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2532 (unsigned long)idev);
2533 idev->mc_tomb = NULL;
2534 idev->mc_ifc_count = 0;
2535 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2536 (unsigned long)idev);
2537 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2538 (unsigned long)idev);
2539 ipv6_mc_reset(idev);
2540 write_unlock_bh(&idev->lock);
2541 }
2542
2543 /*
2544 * Device is about to be destroyed: clean up.
2545 */
2546
2547 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2548 {
2549 struct ifmcaddr6 *i;
2550
2551 /* Deactivate timers */
2552 ipv6_mc_down(idev);
2553
2554 /* Delete all-nodes address. */
2555 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2556 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2557 * fail.
2558 */
2559 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2560
2561 if (idev->cnf.forwarding)
2562 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2563
2564 write_lock_bh(&idev->lock);
2565 while ((i = idev->mc_list) != NULL) {
2566 idev->mc_list = i->next;
2567 write_unlock_bh(&idev->lock);
2568
2569 igmp6_group_dropped(i);
2570 ma_put(i);
2571
2572 write_lock_bh(&idev->lock);
2573 }
2574 write_unlock_bh(&idev->lock);
2575 }
2576
2577 #ifdef CONFIG_PROC_FS
2578 struct igmp6_mc_iter_state {
2579 struct seq_net_private p;
2580 struct net_device *dev;
2581 struct inet6_dev *idev;
2582 };
2583
2584 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2585
2586 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2587 {
2588 struct ifmcaddr6 *im = NULL;
2589 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2590 struct net *net = seq_file_net(seq);
2591
2592 state->idev = NULL;
2593 for_each_netdev_rcu(net, state->dev) {
2594 struct inet6_dev *idev;
2595 idev = __in6_dev_get(state->dev);
2596 if (!idev)
2597 continue;
2598 read_lock_bh(&idev->lock);
2599 im = idev->mc_list;
2600 if (im) {
2601 state->idev = idev;
2602 break;
2603 }
2604 read_unlock_bh(&idev->lock);
2605 }
2606 return im;
2607 }
2608
2609 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2610 {
2611 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2612
2613 im = im->next;
2614 while (!im) {
2615 if (likely(state->idev))
2616 read_unlock_bh(&state->idev->lock);
2617
2618 state->dev = next_net_device_rcu(state->dev);
2619 if (!state->dev) {
2620 state->idev = NULL;
2621 break;
2622 }
2623 state->idev = __in6_dev_get(state->dev);
2624 if (!state->idev)
2625 continue;
2626 read_lock_bh(&state->idev->lock);
2627 im = state->idev->mc_list;
2628 }
2629 return im;
2630 }
2631
2632 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2633 {
2634 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2635 if (im)
2636 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2637 --pos;
2638 return pos ? NULL : im;
2639 }
2640
2641 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2642 __acquires(RCU)
2643 {
2644 rcu_read_lock();
2645 return igmp6_mc_get_idx(seq, *pos);
2646 }
2647
2648 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2649 {
2650 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2651
2652 ++*pos;
2653 return im;
2654 }
2655
2656 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2657 __releases(RCU)
2658 {
2659 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2660
2661 if (likely(state->idev)) {
2662 read_unlock_bh(&state->idev->lock);
2663 state->idev = NULL;
2664 }
2665 state->dev = NULL;
2666 rcu_read_unlock();
2667 }
2668
2669 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2670 {
2671 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2672 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2673
2674 seq_printf(seq,
2675 "%-4d %-15s %pi6 %5d %08X %ld\n",
2676 state->dev->ifindex, state->dev->name,
2677 &im->mca_addr,
2678 im->mca_users, im->mca_flags,
2679 (im->mca_flags&MAF_TIMER_RUNNING) ?
2680 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2681 return 0;
2682 }
2683
2684 static const struct seq_operations igmp6_mc_seq_ops = {
2685 .start = igmp6_mc_seq_start,
2686 .next = igmp6_mc_seq_next,
2687 .stop = igmp6_mc_seq_stop,
2688 .show = igmp6_mc_seq_show,
2689 };
2690
2691 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2692 {
2693 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2694 sizeof(struct igmp6_mc_iter_state));
2695 }
2696
2697 static const struct file_operations igmp6_mc_seq_fops = {
2698 .owner = THIS_MODULE,
2699 .open = igmp6_mc_seq_open,
2700 .read = seq_read,
2701 .llseek = seq_lseek,
2702 .release = seq_release_net,
2703 };
2704
2705 struct igmp6_mcf_iter_state {
2706 struct seq_net_private p;
2707 struct net_device *dev;
2708 struct inet6_dev *idev;
2709 struct ifmcaddr6 *im;
2710 };
2711
2712 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2713
2714 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2715 {
2716 struct ip6_sf_list *psf = NULL;
2717 struct ifmcaddr6 *im = NULL;
2718 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2719 struct net *net = seq_file_net(seq);
2720
2721 state->idev = NULL;
2722 state->im = NULL;
2723 for_each_netdev_rcu(net, state->dev) {
2724 struct inet6_dev *idev;
2725 idev = __in6_dev_get(state->dev);
2726 if (unlikely(idev == NULL))
2727 continue;
2728 read_lock_bh(&idev->lock);
2729 im = idev->mc_list;
2730 if (likely(im)) {
2731 spin_lock_bh(&im->mca_lock);
2732 psf = im->mca_sources;
2733 if (likely(psf)) {
2734 state->im = im;
2735 state->idev = idev;
2736 break;
2737 }
2738 spin_unlock_bh(&im->mca_lock);
2739 }
2740 read_unlock_bh(&idev->lock);
2741 }
2742 return psf;
2743 }
2744
2745 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2746 {
2747 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2748
2749 psf = psf->sf_next;
2750 while (!psf) {
2751 spin_unlock_bh(&state->im->mca_lock);
2752 state->im = state->im->next;
2753 while (!state->im) {
2754 if (likely(state->idev))
2755 read_unlock_bh(&state->idev->lock);
2756
2757 state->dev = next_net_device_rcu(state->dev);
2758 if (!state->dev) {
2759 state->idev = NULL;
2760 goto out;
2761 }
2762 state->idev = __in6_dev_get(state->dev);
2763 if (!state->idev)
2764 continue;
2765 read_lock_bh(&state->idev->lock);
2766 state->im = state->idev->mc_list;
2767 }
2768 if (!state->im)
2769 break;
2770 spin_lock_bh(&state->im->mca_lock);
2771 psf = state->im->mca_sources;
2772 }
2773 out:
2774 return psf;
2775 }
2776
2777 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2778 {
2779 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2780 if (psf)
2781 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2782 --pos;
2783 return pos ? NULL : psf;
2784 }
2785
2786 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2787 __acquires(RCU)
2788 {
2789 rcu_read_lock();
2790 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2791 }
2792
2793 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2794 {
2795 struct ip6_sf_list *psf;
2796 if (v == SEQ_START_TOKEN)
2797 psf = igmp6_mcf_get_first(seq);
2798 else
2799 psf = igmp6_mcf_get_next(seq, v);
2800 ++*pos;
2801 return psf;
2802 }
2803
2804 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2805 __releases(RCU)
2806 {
2807 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2808 if (likely(state->im)) {
2809 spin_unlock_bh(&state->im->mca_lock);
2810 state->im = NULL;
2811 }
2812 if (likely(state->idev)) {
2813 read_unlock_bh(&state->idev->lock);
2814 state->idev = NULL;
2815 }
2816 state->dev = NULL;
2817 rcu_read_unlock();
2818 }
2819
2820 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2821 {
2822 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2823 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2824
2825 if (v == SEQ_START_TOKEN) {
2826 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2827 } else {
2828 seq_printf(seq,
2829 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2830 state->dev->ifindex, state->dev->name,
2831 &state->im->mca_addr,
2832 &psf->sf_addr,
2833 psf->sf_count[MCAST_INCLUDE],
2834 psf->sf_count[MCAST_EXCLUDE]);
2835 }
2836 return 0;
2837 }
2838
2839 static const struct seq_operations igmp6_mcf_seq_ops = {
2840 .start = igmp6_mcf_seq_start,
2841 .next = igmp6_mcf_seq_next,
2842 .stop = igmp6_mcf_seq_stop,
2843 .show = igmp6_mcf_seq_show,
2844 };
2845
2846 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2847 {
2848 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2849 sizeof(struct igmp6_mcf_iter_state));
2850 }
2851
2852 static const struct file_operations igmp6_mcf_seq_fops = {
2853 .owner = THIS_MODULE,
2854 .open = igmp6_mcf_seq_open,
2855 .read = seq_read,
2856 .llseek = seq_lseek,
2857 .release = seq_release_net,
2858 };
2859
2860 static int __net_init igmp6_proc_init(struct net *net)
2861 {
2862 int err;
2863
2864 err = -ENOMEM;
2865 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2866 goto out;
2867 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2868 &igmp6_mcf_seq_fops))
2869 goto out_proc_net_igmp6;
2870
2871 err = 0;
2872 out:
2873 return err;
2874
2875 out_proc_net_igmp6:
2876 remove_proc_entry("igmp6", net->proc_net);
2877 goto out;
2878 }
2879
2880 static void __net_exit igmp6_proc_exit(struct net *net)
2881 {
2882 remove_proc_entry("mcfilter6", net->proc_net);
2883 remove_proc_entry("igmp6", net->proc_net);
2884 }
2885 #else
2886 static inline int igmp6_proc_init(struct net *net)
2887 {
2888 return 0;
2889 }
2890 static inline void igmp6_proc_exit(struct net *net)
2891 {
2892 }
2893 #endif
2894
2895 static int __net_init igmp6_net_init(struct net *net)
2896 {
2897 int err;
2898
2899 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2900 SOCK_RAW, IPPROTO_ICMPV6, net);
2901 if (err < 0) {
2902 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2903 err);
2904 goto out;
2905 }
2906
2907 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2908
2909 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2910 SOCK_RAW, IPPROTO_ICMPV6, net);
2911 if (err < 0) {
2912 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2913 err);
2914 goto out_sock_create;
2915 }
2916
2917 err = igmp6_proc_init(net);
2918 if (err)
2919 goto out_sock_create_autojoin;
2920
2921 return 0;
2922
2923 out_sock_create_autojoin:
2924 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2925 out_sock_create:
2926 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2927 out:
2928 return err;
2929 }
2930
2931 static void __net_exit igmp6_net_exit(struct net *net)
2932 {
2933 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2934 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2935 igmp6_proc_exit(net);
2936 }
2937
2938 static struct pernet_operations igmp6_net_ops = {
2939 .init = igmp6_net_init,
2940 .exit = igmp6_net_exit,
2941 };
2942
2943 int __init igmp6_init(void)
2944 {
2945 return register_pernet_subsys(&igmp6_net_ops);
2946 }
2947
2948 void igmp6_cleanup(void)
2949 {
2950 unregister_pernet_subsys(&igmp6_net_ops);
2951 }
Linux with added FPC-III support